" Cream of mushroom. Come and taste." When Gemma came to stand beside her, Viv dipped some soup into a tasting spoon and handed it to her. "We've a local farmer growing mushrooms for the markets, so I buy whatever he has on hand. This has brown mushrooms, shiitake, and some dried porcini, for depth of flavor."
Gemma took a little sip from the spoon. "Oh, I see what you mean," she said in surprise. "It's delicious, but it's somehow more- mushroomy."
"It's not balanced yet. It needs more salt." Viv added a generous palmful from a dish by the hob and stirred the pot thoroughly. Grabbing two more spoons, she tasted it herself, then handed a spoonful to Gemma. "Now try."
Obediently, Gemma tasted. This time the flavors seemed to pop on her tongue. "Oh, my goodness. It's not salty- it just tastes... I don't know... brighter?"
"That's what salt does. It's a flavor enhancer. You have a good palate. "

― Deborah Crombie , A Bitter Feast (Duncan Kincaid & Gemma James, #18)